What does Photoshop's blend channel op do and what is the Gimp
equivalent? It is used in Kai's Power Tips & Tricks at
http://www.pixelfoundry.com/Tips/KPT1/KPT1.html to produce "K9" near
the end. 

While I'm at it, what does the PS Composite command do? Kai says it
takes 3 layers as input. 

Thanks for your time,

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